Volume 65, 1969

Oxidation of propionaldehyde in aged boric-acid-coated vessels. Part 1.—Kinetic results

Abstract

The maximum rate of oxidation of propionaldehyde in aged boric-acid-coated vessels at 440°C has orders of 1.5 and 0.2 with respect to aldehyde and oxygen respectively. The rate is independent of vessel diameter and is accelerated by addition of inert gas. The main kinetic features can be accounted for by a mechanism in which the rate-determining steps are: C2H5CHO + O2= C2H5CO + HO2(1), HO2+ C2H5CHO = H2O2+ C2H5CO (4), 2HO2= H2O2+ O2(5), H2O2+ M′= 2OH + M′(7)

The autocatalytic nature of the reaction is attributed to reaction (7), which also accounts for the accelerating effect of inert gas. Solution of the simultaneous differential equations for –d[C2H5CHO]/dt and d[H2O2]/dt gives the value of k1= 0.076 ± 0.020 l. mole–1 sec–1, and the values of k4/k½5= 39 ± 5 (l. mole–1 sec–1)½. Using k5= 1.8 × 109 gives k4= 1.85 × 106 l. mole–1 sec–1 at 440°C.

Article information

Article type
Paper

Trans. Faraday Soc., 1969,65, 792-805

Oxidation of propionaldehyde in aged boric-acid-coated vessels. Part 1.—Kinetic results

R. R. Baldwin, R. W. Walker and D. H. Langford, Trans. Faraday Soc., 1969, 65, 792 DOI: 10.1039/TF9696500792

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